On Windows 8 if you press Alt+F4 with the desktop in focus, it displays a shutdown dialog. I was wondering if anyone knows of a way that this same dialog can be launched from the command line as I would like to remap the "ThinkVantage" button on my ThinkPad to display this message.

Does anyone know if this is possible? Using Task Manager I can see that the dialog is produced from explorer.exe but I have no idea how to execute it manually.